>There are a fair number of languages around where a function doesn't>have to exist even when it is called, and a missing function will be>automatically converted into some other construction (e.g. a call to>an external program). This can be useful, as any shell programmer can>witness :-)

And the user has to pray each time before running such a program,
because nobody can tell him what it /will/ do. Such code can only give
hints on what the program /should/ do... ;-)